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0x0000066A

ERROR_PATCH_TARGET_NOT_FOUND

The upgrade cannot be installed by the Windows Installer service because the program to be upgraded may be missing, or the upgrade may update a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade.

win32decimal 1642Windows Installer (MSI)

Matched as: the code as given (hex)

Log a case with no specific solution
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Source: System Error Codes (1300-1699) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09